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Hypohydration and acclimation: effects on hormone responses to exercise/heat stress.
Aviat Space Environ Med. 1984 May; 55(5):365-9.AS

Abstract

This study was designed to assess the effects of hypohydration (-5% body weight) and heat acclimation on plasma cortisol (PC) and growth hormone (GH) responses to exercise (1.34 m X s-1) in a hot-wet (35 degrees C, 79% rh) or hot-dry (49 degrees C, 20% rh) environment. Preacclimation, hypohydration in both the hot-wet and hot-dry environments resulted in significant (p less than 0.05) increments in PC levels during the fourth exercise interval. Acclimation had no effects on PC levels in the euhydrated condition, but in the hot-wet environment there did occur an attenuation of the PC response when hypohydrated. Preacclimation exercise in either the hot-wet or hot-dry environment resulted in significant (p less than 0.05) increments in GH when euhydrated. While the effects of acclimation were inconsistent, hypohydration generally resulted in elevated levels of GH compared to euhydration. We concluded from these studies that hypohydration to -5% of body weight generally elicited elevations in circulating levels of stress hormones, and that acclimation did not effect consistent decrements in these responses.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

6732690

Citation

Francesconi, R P., et al. "Hypohydration and Acclimation: Effects On Hormone Responses to Exercise/heat Stress." Aviation, Space, and Environmental Medicine, vol. 55, no. 5, 1984, pp. 365-9.
Francesconi RP, Sawka MN, Pandolf KB. Hypohydration and acclimation: effects on hormone responses to exercise/heat stress. Aviat Space Environ Med. 1984;55(5):365-9.
Francesconi, R. P., Sawka, M. N., & Pandolf, K. B. (1984). Hypohydration and acclimation: effects on hormone responses to exercise/heat stress. Aviation, Space, and Environmental Medicine, 55(5), 365-9.
Francesconi RP, Sawka MN, Pandolf KB. Hypohydration and Acclimation: Effects On Hormone Responses to Exercise/heat Stress. Aviat Space Environ Med. 1984;55(5):365-9. PubMed PMID: 6732690.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Hypohydration and acclimation: effects on hormone responses to exercise/heat stress. AU - Francesconi,R P, AU - Sawka,M N, AU - Pandolf,K B, PY - 1984/5/1/pubmed PY - 1984/5/1/medline PY - 1984/5/1/entrez SP - 365 EP - 9 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 55 IS - 5 N2 - This study was designed to assess the effects of hypohydration (-5% body weight) and heat acclimation on plasma cortisol (PC) and growth hormone (GH) responses to exercise (1.34 m X s-1) in a hot-wet (35 degrees C, 79% rh) or hot-dry (49 degrees C, 20% rh) environment. Preacclimation, hypohydration in both the hot-wet and hot-dry environments resulted in significant (p less than 0.05) increments in PC levels during the fourth exercise interval. Acclimation had no effects on PC levels in the euhydrated condition, but in the hot-wet environment there did occur an attenuation of the PC response when hypohydrated. Preacclimation exercise in either the hot-wet or hot-dry environment resulted in significant (p less than 0.05) increments in GH when euhydrated. While the effects of acclimation were inconsistent, hypohydration generally resulted in elevated levels of GH compared to euhydration. We concluded from these studies that hypohydration to -5% of body weight generally elicited elevations in circulating levels of stress hormones, and that acclimation did not effect consistent decrements in these responses. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/6732690/Hypohydration_and_acclimation:_effects_on_hormone_responses_to_exercise/heat_stress_ DB - PRIME DP - Unbound Medicine ER -